Final class method not getting tested as desired with Mockito 2

Issue

As described in Mockito 2 docs we can now Mock final classes, so I tried to do it in a simple project, but the results are not proper. Here is my project structure

Here is the org.mockito.plugins.MockMaker text file

mock-maker-inline

Here is a demo activity for testing

class LoginActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_login)
    }

    private fun onLoginPressed(email:String, password:String){

    }

     fun isEmailValid(email: String):Boolean{
        return true
    }
}

here is the test class

class LoginActivityTest{

    @Test
    fun checkLoginValidity(){
        val lognActivity = Mockito.mock(LoginActivity::class.java)
        assert(lognActivity.isEmailValid("yuo"))
    }
}

The test should have passed, since I am always returning true, but here is what I get.

I have also marked and unmarked the resources directory as test resources root, but nothing really happened.

Can you point me out, where am I wrong?

Solution

You mocked your Activity class, so all it's methods allways returns "default" value (for boolean it is false). You need to say Mockito to call real method of class.

`when`(lognActivity.isEmailValid(ArgumentMatchers.any() ?: ""))
    .thenCallRealMethod()

By the way, it is better to use that solution for abstract classes only, because you can't create instance of it with another way. If your class is not abstract, just create it (for Activity test better to use specific tools).

Answered By - Ircover